Sam agrees to do a favor for a friend by looking into the identity of a young amnesiac who was found wearing expensive clothes by two police officers. The investigation leads them to a play the woman was involved in and a mugging gone wrong, then they follow the trail to the woman's past, which seems to have been the trigger for her amnesia. Jack takes some time off work to deal with his father, who is getting worse as his Alzheimers begins to take over and his kidneys fail. Jack finally convinces Frank to seek help, but it's too late, and Jack has to say goodbye to his father.
Guest stars
All episodes — Season 4
Open season page- 1S4 E1
Showdown
Sep 29, 200543 min
Martin and Danny are ambushed by Emil Dornvald, who ends up killing the prisoner they are transoprting. Martin is in serious condition, and a barely wounded Danny is at the end of his rope as he tries to find the man who put Martin in the h
- 2S4 E2
Safe
Oct 6, 200544 min
The team searches for a missing teenager who was paranoid about his own personal safety and left an ominous message behind.
- 3S4 E3
From the Ashes
Oct 13, 200544 min
The team adds a new member who already as a connection to one of the team as they search for a missing prostitute.
- 4S4 E4
Lost Time
Oct 20, 200544 min
After evidence surfaces suggests that a woman believed murdered by her lover seven years earlier may be alive, Jack wonders if he went too far trying to get a confession.
- 5S4 E5
Honor Bound
Oct 27, 200542 min
Wendy Kim goes missing during her shift at the family deli, and the team gets involved to find out what happened to the young Korean woman. It isn't long before they learn that Wendy had recently broken off an engagement to a young Korean m
- 6S4 E6
Viuda Negra
Nov 3, 200543 min
After James Costa is kidnapped after enjoying a night out with his wife in Mexico, Danny and Jack go in at the request of James' mother-in-law, but find that between the Mexican authorities and the grieving wife, no one is too willing to he